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Investigation of PAHs in galactic planetary nebulae with the AKARI/IRC and the Spitzer/IRS

Ohsawa, R.; Onaka, T.; Sakon, I.; Mori, T.I.; Yamamura, I.; Matsuura, M.; Kaneda, H.; Bernard-Salas, J.; Berne, O. and Joblin, C. (2012). Investigation of PAHs in galactic planetary nebulae with the AKARI/IRC and the Spitzer/IRS. Publications of The Korean Astronomical Society, 27(4) pp. 259–260.

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DOI (Digital Object Identifier) Link: https://doi.org/10.5303/PKAS.2012.27.4.259
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Abstract

Polycyclic aromatic hydrocarbons (PAHs) in Galactic planetary nebulae (PNe) are investigated by means of the unidentified infrared (UIR) bands. Continuous near- to mid-infrared spectra of PNe are obtained with the AKARI/IRC and the Spitzer/IRS. All 19 PNe in the present study show prominent dust emissions and we investigate the variation in the intensity ratios among the UIR bands. The ionization fraction and the size distribution of PAHs in PNe are derived using the UIR band ratios. We find that the ionization fraction of PAHs in PNe is around 0.0-0.6 and that small PAHs are scarce. The present result indicates a systematic trend of the aliphatic feature to become weak as the PAH ionization fraction increases.

Item Type: Journal Item
Copyright Holders: 2012 The Korean Astronomical Society
ISSN: 2287-6936
Keywords: infrared; spectroscopy; PAHs; star; planetary nebulae
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 38247
Depositing User: Astrid Peterkin
Date Deposited: 11 Sep 2013 10:55
Last Modified: 15 Dec 2018 11:55
URI: http://oro.open.ac.uk/id/eprint/38247
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